Clio API v4 returns ForbiddenError for every request. For example this request works without problem:
GET /api/v2/users/who_am_i HTTP/1.1
Host: app.clio.com
Authorization: Bearer ***
And this request doesn't work:
GET /api/v4/users/who_am_i HTTP/1.1
Host: app.clio.com
Authorization: Bearer ***
This is the error returned with status 403:
{"error":{"type":"ForbiddenError","message":"User is forbidden from taking that action"}}
The same happens with any other request.